Fix research xp generation

core/level_game_state.gd

@@ -440,14 +440,6 @@ func get_effective_multiplier(generator_id: StringName, kind: int) -> float:
 	return multiplier
 
 func _initialize_research() -> void:
-	research_tracker = Node.new()
-	research_tracker.set_script(load("res://core/research/research_xp_tracker.gd"))
-	add_child(research_tracker)
-	
-	var tracker: ResearchXPTracker = research_tracker as ResearchXPTracker
-	if tracker:
-		tracker.game_state = self
-	
 	if research_catalogue:
 		for research in research_catalogue.get_all_research():
 			register_research(research.id)